I will never love you for the rest of my life. Because I already have someone I love. My fiancé declared this to me, but since it's a political marriage anyway, it doesn't matter. After that, the engagement was broken off and I learned that the other person was... my younger sister. That's what I thought before finding that out, anyway.

# Translation When the Duke's daughter Liesel was three years old, she lost both her parents in an accident and was taken in by her uncle and aunt, her father's younger brother and his wife. The uncle inherited the title, and Liesel was raised while being treated differently from her cousin, her adoptive younger sister. She thought this was inevitable, but when she came of age, she was chosen as the fiancée of the Crown Prince. However, the Crown Prince declared to her: "I will never love you for life. I have someone I truly love." Since it was a political arrangement, she thought this too was unavoidable. But a year later, the Crown Prince declared: "I will break off my engagement with you. I will live for true love," and cast her out with nothing but the clothes on her back. And the person he truly loved was her adoptive sister? Abandoned by her adoptive parents as well, Liesel fell into despair. Having given up on everything, what method of revenge did the oppressed Liesel take?